<template>
  <div class="login-container">
    <el-form ref="loginForm" :model="loginForm" :rules="loginRules" class="login-form" auto-complete="on" label-position="left">

      <div class="title-container">
        <h3 class="title">沐雪落叶纷飞</h3>
      </div>

      <!--      账号-->
      <el-form-item prop="loginId">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="loginId"
          v-model="loginForm.loginId"
          placeholder="请输入管理员账号"
          name="loginId"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <!--      密码-->
      <el-form-item prop="loginPwd">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.loginPwd"
          :type="passwordType"
          placeholder="请输入密码"
          name="loginPwd"
          tabindex="2"
          auto-complete="on"
          @keyup.enter.native="handleLogin"
        />
        <span class="show-pwd" @click="showPwd">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>
      <!--      验证码-->
      <div class="captchaContainer">
        <el-form-item prop="captcha" class="captcha-input">
          <span class="svg-container">
            <svg-icon icon-class="nested" />
          </span>
          <el-input
            ref="captcha"
            v-model="loginForm.captcha"
            type="text"
            placeholder="请输入验证码"
            name="captcha"
            tabindex="3"
            auto-complete="on"
          />
        </el-form-item>
        <!--        验证码的图片-->
        <div class="captchaImg" @click="getChat" v-html="captchaImg">
        </div>
      </div>

<!--      7天内免登录-->
      <div style="margin-bottom: 15px">
        <el-checkbox v-model="loginForm.checked">7天内免登录</el-checkbox>
      </div>
      <el-button class="button" :loading="loading" type="primary" style="width:100%;margin-bottom:30px;" @click.native.prevent="handleLogin">登录</el-button>

    </el-form>
  </div>
</template>

<script>
import { validUsername } from '@/utils/validate'
import { getCaptcha } from '@/api/captcha'

export default {
  name: 'Login',
  async created() {
    await this.getChat()
  },
  data() {
    const validateUsername = (rule, value, callback) => {
      if (!validUsername(value)) {
        callback(new Error('账号必填'))
      } else {
        callback()
      }
    }
    const validatePassword = (rule, value, callback) => {
      if (value.length < 6) {
        callback(new Error('密码长度不能少于6位'))
      } else {
        callback()
      }
    }
    const validateCaptcha = (rule, value, callback) => {
      if (value.length <= 0) {
        callback(new Error('验证码必填'))
      } else {
        callback()
      }
    }
    return {
      loginForm: {
        loginId: 'admin', // 账号
        loginPwd: '123123', // 密码
        captcha: '', // 验证码
        checked: false
      },
      loginRules: { // 验证规则
        loginId: [{ required: true, trigger: 'blur', validator: validateUsername }],
        loginPwd: [{ required: true, trigger: 'blur', validator: validatePassword },
          { min: 6, max: 15, trigger: 'blur', message: '密码长度6-15位' }],
        captcha: [{ required: true, trigger: 'blur', validator: validateCaptcha }]
      },
      loading: false, // 加载效果
      passwordType: 'password',
      redirect: undefined,
      captchaImg: ''
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  methods: {
    showPwd() {
      if (this.passwordType === 'password') {
        this.passwordType = ''
      } else {
        this.passwordType = 'password'
      }
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          this.loginForm.remember = this.loginForm.checked ? 7 : 0
          this.$store.dispatch('user/login', this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || '/' })
            this.loading = false
          }).catch((res) => {
            let msg = ''
            if (typeof res === 'string') {
              res = JSON.parse(res)
              msg = res.msg
            } else {
              msg = '账号密码错误'
            }
            this.$message({
              type: 'error',
              message: msg
            })
            this.getChat()
            this.loading = false
          })
        } else {
          console.log('验证不合格')
          return false
        }
      })
    },
    async getChat() {
      // 获取验证码事件
      this.captchaImg = await getCaptcha()
    }
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
/* Detail see https://github.com/PanJiaChen/vue-element-admin/pull/927 */

$bg:#283443;
$light_gray:#fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  background: url("../../assets/background/banner.jpg") no-repeat;
  background-size: 100% 100%;
  background-origin: border-box;
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg:#2d3a4b;
$dark_gray:#889aa4;
$light_gray:#000;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding:10px 35px;
    margin: 160px auto 0px;
    overflow: hidden;
    background:  linear-gradient(rgb(56, 189, 248), rgb(186, 230, 253));
    opacity: 0.89;
    border-radius: 15px;
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: #eee;
      margin: 10px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }
}
.captcha-input {
  width: 70%;
}
.captchaContainer{
  display: flex;
  justify-content: space-between;
}
  .captchaImg{
    width: 150px;
    height: 52px;
    border-radius: 4px;
    margin-left: 20px;
    cursor: pointer;
    box-sizing: border-box;
  }

.button {
  text-align: center;
  color: #fff;
  text-decoration: none;
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
  border-radius: 30px;
  font-size: 24px;
  background-size: 400%;
  text-transform: uppercase;
}

.button:hover {
  animation: animate 8s linear infinite;
}

@keyframes animate {
  0% {
    background-position: 0%;
  }
  100% {
    background-position: 400%;
  }
}

.button::before {
  content: '';
  position: absolute;
  top: -5px;
  left: -5px;
  right: -5px;
  bottom: -5px;
  z-index: -1;
  background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
  border-radius: 40px;
  background-size: 400%;
  opacity: -1;
  transition: 0.5s;
}

.button:hover::before {
  filter: blur(20px);
  opacity: 1;
}
</style>
